A further tale documents that a demon named Madan acquired Vak-siddhi, by which whichever he claimed came real. He misused it to hassle human beings and murder men and women. One more etymology suggests that valga means "to paralyze" and symbolizes the strength of stambhana, "paralysis" that the goddess is alleged to grant; https://www.youtube.com/shorts/5VeSyP9JRw0